Aren't today's houses significantly over-dimensioned?

[haavard]

Translate to km/h so most people understand much better what speed the wind has, km/h most people can relate to.

30 m/s should be roughly around 108 km/h... good speed!!!

Are you sure?
If it blows 108 km/h, it tells me nothing at all. 30m/s, on the other hand, I know what is. And 10m/s is what it often blows. No one knows what the equivalent of about 40 km/h is?

 

[Glufsglufs]

For my part, I can more easily relate to how fast 100 km/h is than if someone says "the speed is now 30 m/s." Those who live near or are often by the water might relate differently as they experience wind speeds more frequently and talk about them more often using m/s. I personally prefer to relate to m/s if I'm going out on the sea and relate the wind to the waves and vice versa by checking the foam, but on land and for the average person, km/h might be easier to relate to.

 

[Alfred Jonsson]

How much force must be applied to press against 500 Newton meters?

That's the force that walls and ceilings must withstand.

 

[felldin]

500 newtons per square meter is equivalent to evenly distributing 50 kg over one square meter.

 

[mycke_nu]

Sure, we build more stable today, but during extreme weather, it feels reassuring.

Where I live, we often have winds exceeding 30m/s, which involves enormous forces.

30m/s means a force of over 500 Newton/sqm, which corresponds to about 200 hp and that's per square meter!!

1500 N, I would argue.

If we then assume that a gable is 20 m2, it pulls/pushes with 3 tons. Like hooking up a tractor and pulling on.

 

[Korvgubbe]

But then the force will be in the wrong direction, it's very rare that the wind pulls a wall outward instead of pushing it inward

 

[Alfred Jonsson]

But then the force would be in the wrong direction, it's very rare for the wind to pull a wall outward instead of pushing it inward

A couple of weeks ago I saw a tightly packed wooden fence 1 m + 3.5 with 5 post feet of this model
http://webservice.oxygenekatalog.dk/getpic.aspx?ImgSize=3&ImgID=45517

They were bolted down in concrete and what had happened was that all the base plates remained but were severely bent and on 3 of the post feet, the welds had completely given in, so the fence would have fallen if it were not for the angle irons attached to one wall.

This on such a small area as 3.5 sqm, it must have been very windy. d^_^b

 

[mycke_nu]

Internal wind load (pressure) also occurs on the inside of the opposite exterior wall if the building is not completely sealed, plus suction forces on the outside.

 

[andersmc]

Are you sure?
If it's blowing 108 km/h, it doesn't tell me anything. 30m/s, on the other hand, I know what that is. And 10m/s is what it usually blows. Nobody knows what the equivalent to about 40 km/h is, right?

Well, imagine you're driving in a car at 108km/h and stick your head out the window or stand up in the sunroof. Just holding out your hand at that speed becomes really tough.

 

[Alfred Jonsson]

Well, imagine you're in a car at 108km/h and you stick your head out the window or stand up through the sunroof. Even just holding your hand out at that speed becomes really tough.

Try then to hold up a wooden panel of a couple of square meters at that speed

:wow:

I've managed to crack some plasterboards when they've blown on the roof when driving too fast.

 

[snickarboden]

But there are quite a few old houses that blow over anyway
Something I am grateful for *S* but I did reinforce a little a couple of years ago when I was tired of the creaking, or rather I was slightly worried at hurricane strength.

/Kent

 

[AndersS]

Strengthening and building stronger in specific sections to improve durability can result in shifting forces to other areas. In some cases, an excessively rigid construction might mean that some part breaks instead of having materials that flex a bit, all depending on the type of material. If a house flexes a little, the structure can withstand forces, for instance, during strong winds. If certain parts are reinforced to eliminate flexibility, these forces may be transferred to other areas, such as fittings, which then bear even greater loads and forces.

When it comes to wind, everything relates to m/s, so for me km/h is just confusing (I am not into boating).

Spontaneously, it seems like houses today are over-dimensioned, and this can be questioned. It's very rare to see a regular single-family house collapse due to weather/wind if the construction is intact and unaffected by rot or similar issues. Isn’t it the requirement for insulation that drives the dimensions, making both walls and ceiling joists thicker to accommodate the insulation? Walls that are 250-300mm thick are not based on strength.

 

[jeppeknaster]

Aren't the dimensions driven by the requirement for insulation, as it makes both walls and attic beams thicker to accommodate the insulation? Walls that are 250-300mm thick aren't due to structural strength.

That's right. But instead of building load-bearing frame structures with 220x45 and thermal bridges, one should be able to build smarter with an external load-bearing structure of 95x45 or 120x45 and an inner wall of type 95x45 with a continuous insulation layer of about 70-95mm between the two walls.

 

[thomasx]

One could reduce some thermal bridges, save some money, and slightly increase the insulation by building 200-300 mm thick walls but with thinner studs.

To withstand a pressure of 500Nm, one must press with exactly 500Nm

Wind speed in m/s tells me everything, in km/h not much, I suspect it's the same for most people since weather forecasts indicate wind precisely in m/s.

It's not uncommon at all for there to be outward pressure on building components when it blows a lot; on the contrary, I would say it's very common, and that's precisely what often causes damage to buildings caused by wind. Roofs tend to seek new existence in that manner. The same effect that allows planes to fly.

Yes, standing with a particle board against or with the wind at 16m/s is not done without consequences unless you are very strong But imagine hoisting 150 m2 of sail on a sailboat in that wind. Then, my friends, we are talking about an adrenaline rush, I can tell you. Once, on a slightly smaller boat that didn't have quite as much sail, we outpaced a RIB Yihaa

 

[cem77]

That's right. But instead of building load-bearing structures in 220x45 with thermal bridges, you should be able to build smarter with an outer load-bearing structure of 95x45 or 120x45 and an inner wall of type 95x45 with a type 70-95mm thick continuous insulation layer between the two walls.

That's exactly what can and is done .